Improvement in elevators



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N0148,802 PatentedMarch 24.1874.

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With (was fn ventola' UNITED STATES PATENT FFICE.

JOHN BERNHARD, OF SHENANDOAH, PENNSYLVANIA.

IMP-Rovl-:MENT IN ELEvAToRs.

Specification forming part of Letters Patent No. 148,802, dated March 24, 1874; apl lication filed February 20, 1874.

To all whom it may concern:

Be it known that I, JOHN BERNHARD, of Shenandoah, in the county of Schuylkill and State of Pennsylvania, have invented a new and valuable Improvement in Elevator Safety- Cages 5 and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l is a front elevation, showing the working of the lifting-bar a, the spring f, the connecting-bar c, and the arms or cranks cl d. Fig. 2 is a side elevation, showing the working of the bar a., the connecting-bars c c, the toothed eccentric wheels e e, together with the frames b h, and the columns or guides g. Fin'. 3 is a horizontal view, showing the lifting-bar u, the connecting bars c c, the arms or cranks d d, the pivots or joints at k and d, the shafts or spindles t' i, the columns or guides g g, the toothed eccentric wheels e e, and the frame h in part or sectional view. Fig. 4 is a view showing a portion of the working parts in a part of the frame b and 7L, and a view of the lifting-bar a.

a is a lifting-bar, of iron or other metal, to which is to be attached the rope or chain which is to hoist or lower the cage. b is a portion of the frame-work of the cage, and, in connection with h, forms the frame or body of the cage. c c are connecting-bars, which connect the lifting-bar a with the arms or cranks d d, and which also connect the toothed eccentric wheels e e with each other. d d are arms or cranks fastened to the shafts or spindles c' c'. c e are'toothed eccentric wheels fastened to the shafts or spindles i vl, and operated by the connecting-bars c c. f is a spring fastened by the sleeve Z, and working against the frame b. g g are columns or guides, of wood or other suitable material, against which the toothed eccentric wheels work. h h is a part of the frame, and, with b b, forms the frame or body of the cage. i are shafts or spindles, working in bearings in the frame 7L h, and to which the toothed eccentric wheels c e and connectingbars c c are fastened. 7c is a shoulder and pivot or joint connecting the lifting-bar a to the connecting-bars c c. l is a movable sleeve, securing the spring j' to the lifting-bar a by means of a key or pin, and also forming a shoulder.

/Vhen a hoisting power is applied by means of a rope or chain, or any other means, to the lifting-bar a, the lifting-bar a rises as far as the shoulders, (shown at the points 7c and 1,) when the lifting strain comes on the frame or cage proper b and h.

Should the rope or chain break by any accident or in any way whatever, the spring f will draw down the lifting-bar a', and, through the means of the connecting-bars c c, as shown in Fig. 2, will' force the toothed eccentric wheels e' e in and against the columns or guides g g, as shown in the same figure, thereby holding and fastening the cage in a firm and stationary position, and preventing it from falling or sliding down. As soon as the rope or chain draws the lifting-bar a up, the toothed eccentric wheels become released through the working of the connecting-bars c c, which are connected by pivoted or jointed connections with the lifting-bar a.

So long as this rope or chain remains unbroken, the cage will work up and down with perfect ease and freedom; but if it breaks, then the cage will stop instantaneously, as before described.

Having thus described my invention, I desire to claim- The lifting-bar a, with the connecting-bars c c, the arms or cranks d d, the toothed eccentric wheels e e, the spring f, the columns or guides g g, the shafts or spindles it', the shoulder k, the movable sleeve and shoulder Z, and the frame b and h, all combined substantially as and for the purpose hereinbefore set forth.

JOHN BERNHARD. Witnesses:

J. J. MURPHY, HoRAcE B. McCooL. 

